hinged

A map, plate, or other separate sheet which has
been folded along the binding edge in order to
reduce the possibility of the sheet tearing away
from the one to which it is attached, and also to
allow it to lie flat and turn easily during use.
hinged and jointed plate. Two contiguous plates
each of which has had a strip cut away at the
binding edge, and are then joined together by
means of a common strip of Japanese copying paper
or linen, forming a hinge. See also: GUARD (2) .